[C++] fixed DispatcherTest
[C++] fixed DispatcherTest

It uses new JsonSerializer and no Qt Joynr types any more

Change-Id: I9e90b6818fa5369873d17e9b74b225f5fef58c44

clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr